Pointing-tool carriage for wood-screw machines.



C. T. BRENNAN.

POINTING TOOL CARRIAGE FOR WOOD SCREW MACHINES.

APPLICATION FILED SEPT. 11. 1915.

1,163,885, Patented Dec. 14, 1915.

:oLuMBrA PLANQGRAPH co..wAsH|NGTDN. D. c.

narran srarns rarrinr ermee.

CHARLES T. BRENNAN, OF WATER-BURY, CONNECTICUT, ASSIGNOR TO THE E. J.

MANVILLE MACHINE COMPANY, OF WATERBUR TION OF CONNECTICUT.

, CONNECTICUT, A CORPORA- POINTING-TOOL CARRIAGE FOR WOOD-SCREW MACHINES.

Application led September 17, 1915.

To @ZZ whom t may concern:

Be it known that I, CHARLES T. BRENNAN, a citizen of the United States, residing at Waterbury, in the co-unty of New Haven and State of Connecticut, have invented a new and useful Improvement in Pointing- Tool Carriages for Wood-Screw Machines, of which the following is a. specification.

Some types of machines for making wood screws have a tool which moves up and forms points on the blanks before they are threaded.

This invention relates to the construction of the carriage for such a. tool in machines of this class.

In these machines there is ordinarily a back rest which moves forward and supports the blanks while they are being threaded. The pointing tool must, of course, get out ofthe way before the back rest can get into posititon to support the blanks. Considerable time is lost, particularly when the machine is operating upon small blanks, in waiting for the pointing tool to withdraw. The mechanisms are occasionally so timed, or get so out of time, that the back rest comes forward and strikes and breaks, or injures the pointing tool holder. F requently the blanks are misplaced, or some obstruction is encountered that causes damage to the back rest or its operating mechanism, or to the pointing tool or its operating mechanism.

The object of this invention is to so construct the pointing tool carriage that it will surely get out of the way of the back rest, no matter how the mechanisms are timed, thus permitting increased speed in the operation of the machine with a correspondingly greater output and eliminating the danger of accidental injury to the parts. This object it attained by mounting the pointing tool post on a holder that is pivoted to the slide which is reciprocated for moving the pointing tool to and from the blanks, and that is held in normal position by a spring in such manner that the holder can yield in case the tool meets any obstruction, or it is encountered by the back rest.

In the accompanying drawings Figure l shows a plan of a wood-screw machine pointing-mechanism which embodies this invention. Fig. 2 shows a front elevation of the same. F ig. 3 shows a plan of the slide Specification of Letters Patent.

Patented Dec. le, i915. Serial No. 51,177.

and horizontal section of the tool holder, illustrating the manner of connecting these parts and retaining the holder in normal operative position.

The slide l is movably held by plates 2 in the front of a bracket 3 that is adapted to be fastened to the frame of the screw machine. The slide is reciprocated by a lever et which is pivotally mounted on a bracket 5 that is fastened to the bracket 3--the lever being oscillated in the machine by a suitable cam. Projecting forwardly from the outer end of the slide is an extension 6, and extending vertically through this extension of the slide is a stud 7.

The pointing tool 8, of usual construction, is clamped in the ordinary manner, in the head 9 of the common form of tool post l0. This post is adj ustably clamped in an opening in the end of the tool holder 1l. The tool holder is mortised and fitted upon the forward extension at the end of the slide. The stud 7 that passes through the slide extension extends through slots l2 in the sides of the tool holder and retains the parts together. A sprin 13 is arranged to thrust between the sli e extension, or a. screw 14 set into the extension, and the end of the holder so as to normally push the holder forward. A set screw l5 turns through the rear end of the holder and is adapted to be set so as to, by engagement with the end of the bracket 3, limit the forward movement of the holder. Screws 16 may also be provided for adjusting the position of the holder with relation to the pivot stud 7 on the slide.

The pointing tool is held up to its work by the spring between the holder and slide. Should, however, a blank be misplaced, or should the pointing tool meet any obstruction, the spring will yield and allow the holder to move back, the slotted connection of the holder' to the slide permitting this, and as the spring is near the front and out of line between the pivot stud and the tool, if the back rest or any other part should in coming forward encounter the head of the tool post, the holder will swing out on the pivot stud, the spring permitting this. As a result of thissliding and swinging connection of the holder with the slide, which carries the holder back and forth, and the arrangement of the single spring, which holds the tool to its work, the speed of the machine may be materially increased, for the back rest may be moved up to support the blank before the tool head is withdrawn suilieiently far to clear the back rest.

The invention claimed is:

1. A carriage for a pointing tool, consisting of a reciprooatory slide, a tool holder pivoted to the slide, and a spring thrusting between the slide and the holder and normally retaining the holder in operative position.

2. A carriage for a pointing tool, consisting of a reciprocatory slide, a tool holder mounted on and movable with the slide and having a reciprocatory and oscillatory movement independent thereof, and a spring thrusting` between the slide and the holder and normally retaining the holder in operative position.

3. A carriage for a pointing tool, consisting of a reoiprocatory slide, a tool holder mounted on and movable with the slide and having a reoiprooatory movement independent thereof, and a spring thrusting between the slide and the holder and normally retaining the holder in operative position.

i- A carriage for a pointing tool, oonsisting of a reoiprooatory slide, a tool holder mounted on and movable with the slide and having an oscillatory movement independent thereof, and a spring thrusting between the slide and the holder and normally retaining the holder in operative position.

5. A pointing tool mechanism consisting of a slide, means for reciprocating the slide, a tool holder, means loosely connecting the tool holder to the slide so that the tool holder may have an independent oscillatory and reciprooatory movement with relation to the slide, and a spring thrusting between the slide and the holder and normally re taining the holder in operative position.

CHARLES T. BRENNAN.

Copies of this patent may be obtained for live cents each, by addressing the Commissioner of Patents.

Y Washington, D. C. 

